English word firable comes from English fire, English -able

Detailed word origin of firable

Dictionary entry	Language	Definition
fire	English (eng)	(farriery) to cauterize. (intransitive) to shoot a gun, a cannon or a similar weapon. (intransitive, computer sciences, software engineering) to initiate an event (by means of an event handler). (intransitive, dated) to be irritated or inflamed with passion. (intransitive, dated) to catch fire; to be kindled. (intransitive, physiology) to cause an action potential in a cell. (transitive) to [...]
-able	English (eng)	Able to be done; fit to be done.. An adjectival suffix; forms adjectives meaning:. Due to be.. Giving, or inclined to.. Relevant to or suitable to, in accordance with.. Subject to.
firable	English (eng)	Capable of being fired (in various senses).

Words with the same origin as firable